Machine for manufacturing dowels or rivets.



PATENTED SEPT. 29, 1903.

A. BALDENWBG. MACHINE'FOR MANUFACTURING DOWELS OR RIVETS.V

A?PLIOATION FILED MAR. 3, 1902.

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tlg@ wif? PATENTED SET. 29. 1903.

A. BALDBNWEG. MACHINE POR MANUPAGTURING 1:0WELS UR RIVBTS.

APPLIOATION FILED MAB. 3, 1902.

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PATBNTBD SEPT. 29, 190s.

A. BALDENWBG- MACHINE FOR MANUFAUTURING DOWELS 0R RIVETS.

APPLICATION FILED MAB. 3. 1902.

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No. 739,810. PATENTED SEPT. 29, 1903. A. BALDENWEG. MACHINE POR MANUPAGTURING DoWBLs 0R. RIVETS.

APPLIATION FILED MAR.. 3. 1902A H0 MUDEL. 4 SHEBTSSHEET 4.

, first come together sidewise, one pair seizing Dowels or Rivets, of which the following is a UNITED STATES El'atented September 29, 1903.

PATENT OFFICE.

ALEXANDER BALDENWEG, OF SCHOENENWERD, SVITZERLAND, ASSIGNOR TO C. F. BALLY SONS, OF SCHOENENWERD, SWITZERLAND.

MACHINE FOR MANUFACTURING DOWELS OR RlVETS.

SPECIFICATION forming para of Leu-.ers Patent No. 'rsa/81o, dated september 29, 1903.

Application iiled March 3, 1902K.

To @ZZ whom t may concern: 1

Be it known that I, ALEXANDER BALDEN- WEG, a citizen of the Republic of Switzerland, and a resident of Schoenenwerd, Switzerland, have invented' certain new and useful Improvements in Machines for Manufacturing specification.

This invention relates to certain new and useful improvements in machines for manufacturing dowels or rivets.

According to the invention a plain wire is operated on in such a way that aftertreatment it consists of a series of short sections, each comprising a central flange, disk, or head situated between two short piecesor lengths of wire, one of which is flattened out considerably, whereas the other is unilattened. These short pieces are intended to form the two ends of the dowel or rivet. The machine for effecting 4this operation comprises, essentially, two pairs of dies, which and holding the wire, while the other pair serve to produce the short flattened and unflattened lengths to constitute the ends of the dowel or rivet. The dies are also arranged t0 be afterward forced together endwise to cause the wirebetween them to spread out and produce the central flange, disk, or head. Thus at each operation one section is partly produced by the formation of adisk'with a flattened piece of Wire on its lower side,"and the previous section is finished by the shaping of the unflattened piece of wireat itsupper side. The wire is roughened'or corrugated by the dies to insure its'obtaining a better hold. When the sections are cut off, the flattened pieces are left of a V shape, with two separate points or fangs intended to spread apart and clench into any article in which they may be forced.

In order that the invention may be clearly understood, reference will now be made to the accompanying drawings, nwhich- Figure l is a vertical section 'of the main part' of" the machine, showing the arrangement of the dies, the latter being apart or open. Figs. 2 and 3 are corresponding views, respectively showing the dies brought together laterally and endwise. Figs. 4 and 5 Serial No. 96,504. (No model.)

are` plans corresponding to Figs. 1 and 2. Fig. 6 is a detail of the upper part of the jaws which carry the dies. Figs. 7 and 8 are inner side views' of the upper and lower dies, re- 55 spectively.- Fig. 9 shows the lower dies as seen in plan. Figs. 10 and l1 are front and side views of a piece of wire partly finished. Figs. 12 and Vi3 are similar views, to a larger scale, showing more clearly the Iinishe'd part 6o and the way the sections are intended to be cut off to leave the V-shaped points. Fig. 14 shows one of the dowels or rivets thus obtained. Figs. 15 and 16 are elevations at right angles to each other, showing the general construction of the machine.

a o.' and bh' are respectively the upper and lower pairs of dies. They are iitted in correspending jaws c c d d', ofjwhich those on the left move endwise or vertically. The upper jaws lit one into the other, the jaw c having a ledge or shoulder c2 at each side, Fig. 6, fitting over projecting cheeks c3 on the jaw c'. The lateral separation by springs e, arranged in pockets e' on the jaw d', and the endwise/separation is edected by a springf, situated in a pocket f'. The latter movement can be limited and adj usted by a set-screw c'L in the adjacent fixed part of the 8o ed on the end'of a shaft h2, (or on a disk on 85 said end,)lwhich isturnedor 'oscillated by suitable means, as hereinafter described.

The endwise ordownward movement of the upper dies is produced by a hammer or pressing-block c5, which comes down at the proper 9o time on the upper jaws c c'.

The wire il is fed lforward by ay pair of grooved disks j, operated by a ratchet j' and pawl jz, Worked in any suitable manner. This feeding device, I y only shown diagrammatioally, as itsconstruction and arrangement maybe of any suitable kind, as will be' readilyunderstood. After k leaving the feed-wheels the wire passes down through an upper guide or nozzle 7c to the dies, and from the lat-ter it is led to a lower guide or laterally and those at the top move 7o of the jaws is effected partly j 5 as well as the hammer c5, is

a central hole in the hammer c5 and Ico tube Z. Both the guides Zr, Z are so arranged that they tend to set themselves midway between the dies, and thereby free the wire from the latter after the pressing operation. To this end the upper. guide 7c has projections Zt', which iit into pockets 7a2 on the upper dies and rest against springs k3. The reaction of these springs both holds the guide central andalso assists in. separating the dies. The lower guideZ is hinged to an arm Z and is acted on by a blade-spring Z2, which is prevented from pressing it too far by a stop Z3. Suitable recesses 7a4 Z4 are provided to receive these guides when the jaws come together.

The upper dies CZ (see Fig. 7) have a roughened semicircular groove 0,2, in which the wire is held without its shape being materially altered. The lower dies have also a short groove b2 of substantially the same shape as 61,2,- but at its upper part b3 (see Figs. 8 and 9) this groove widens out laterally and becomes correspondingly shallower. The result is that the wire coming between the grooves a2 and b2 preserves substantially its original shape, as seen at t4, Figs. 10 to 13, but that coming between the parts b3 is flattened out, as at i3. The grooves in the dies are suitably scored or roughened to produce ridges, corrugations, or notches in the parts i2 and S of the wire, and so enable them to get abetter hold. This roughness in the dies is not shown in some of the gures for the sake of clearness.

Referring now to Figs. 15 and 16, the parts aforesaid are mounted in a suitable frame m, and the Wire isfed from a reel m, carried by a bracket m2, being after treatment wound upon a second reel m3 in the lower part of' the frame. The dies c c CZ d and block Zt are arranged in guides n, and the plunger c5 works in the head part miof the frame. The upper endof the plunger is pressed upon by the lower movable jaw of a pair of springjaws o, which tends to force it down. It is raised by a cam or wiperp on the cam-shaft 19. This shaft also carries two other cams p2 p3 for working the dies and the wire-feed, respectively. The die-cam works an arm h3 on the shaft h2, and so gives it a rocking motion, such as required for operating the pin 7L and slide-block Zt', whereby the dies are pressed together. The camp3 works against a projection js on a vertical sliding rod'7'4, and so raises and lowers this rod. The rod in its turn engages (by means of a'pin or projection) a leverj, carrying the pawlj2 and normally drawn down bya springji. The stroke of the pawl can therefore be varied by changing the cam or by a stop set to limit the backward stoke of the lever. vThe cam-shaftp is driven by fast and loose pulleys m4. The wire is fed down through eye-holes o' in the spring-jaws o and passes down the center of the plunger e5.-

The action is as follows: The parts being in the position shown in Fig. l, the shaft h2 oscillates and the pin h forces the jaws c cZ against the jaws c' cZ, Fig. 2. The upper dies a a.' thus grip the wire i, and the lower dies ZJ b do the same as regards their grooves b2; but the part b3 compresses its portion of the wire and flattens it out in the manner above referred to, the parts t" 2 assuming a bottle-neck outline. The Wire being still tightly held in the dies, the hammer or plunger c5 is caused to descend. and forces the upper part down toward the lower pair, Fig. 3. In this movement the portion of wire between the dies is compressed in the direction of its length and caused to spread out laterally and form a head or disk t5, lying at right angles to the wire. The crank-pin h now moves the other way, the hammer c5 rises, and the springs e, f, and 7c3 react and restore the parts to the position shown in Fig. 1. The feedpawlj2 is now operated and advances the wire another step, and the dies coming together again, Fig. 2, produce above the last disk i3 another short unattened piece of wire t', terminating in a attened piece t2. Afterward the upperdies descend, Fig. 3, and produce another disk, and then the parts resume their former position again, ready for the next operation, and so on.

The size of the disks or heads produced can be varied by regulating the stroke of the upper dies, which obviously depends on the height they are allowed to rise after each operation. This is readily controlled by the adj ustable stop c4. The stroke of the feed-pawl j? is also adjusted to correspondat the same time. It will be readily seen, Figs. 12 and 13, that when a lengthof wire which has been treated in this way is out by a suitable tool, as shown in dotted lines, Fig. 12, the broad flattened parts Z2 form a double or V-shaped point on one side of the disk (see Fig. 14) and the uniiattened parts form a single point on the other side thereof. The dowels or double-ended rivets thus obtained are especially suitable for riveting together the inner and outer soles of boots and shoes and for other like purposes. They lie entirely between the two parts or thicknesses which they unite, and thus provide an invisible joint, which is free from the objections that apply to ordinary rivets, while the central disks or heads 3 facilitate the driving in of the rivets and also prevent them being accidentally driven in too far. Moreover, the clenching of the double points andthe roughening or corrugation of the sides and edges of the rivets insure a very rm and secure hold being obtained, even in very thin material.

Obviously the sectionv of the wire t' and the shape of the heads t2 may be varied as desired.

What I claim, and desire to secure by Letters Patentof the United States, is

1. In a machine for .the production from plain wire, of wire suitable for cutting up into dowels or rivets, the combination of two pairs of dies, one pair for holding and the other for shaping the wire, means for forcing said dies together both laterally, and endwise, and

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means for freeing the wire from the dies after each pressing operation, substantially as described.

2. In a machine for the production from plain wire of wire suitable for cutting up into dowels or rivets, the combination of two pairs of dies, means for operating said dies, upper and lower guides for the wire situated between the die blocks, means for supporting said guides midway between the dies when the latter are open, and springs for returning them to this position after the dies have acted, substantially as described.

3. In a machine for the production from plain wire, of wire suitable for cutting up into rivets, the combination of two pairs of dies, sliding jaws for holding said dies, a slide for forcing said jaws and dies together laterally, a hammer for forcing them together endwise, feed-wheels for supplying the wire, a springpressed guide between the upper jaws, and a corresponding spring-pressed guide extending between the lower jaws, substantially as described. i

4. In a machine for the production from plain wire, of wire suitable for cutting up intorivets, the combination of an upper pair of dies having grooves to grip and hold the wire Without altering its shape, a lower pair having grooves which are partly like those in the upper dies and partly divergent and shallow to produce broad flattened portions in the wire, means for forcing the dies together endwise to expand the wire between them and forni disks or heads at right angles thereto, and means for freeing the wire from the dies after each pressing operation, substantially as described.

5. In a machine for the production from plain wire, of wire suitable for cutting up into rivets, the combination of two pairs of dies for` gripping and shaping the wire, sliding jaws carrying said dies, a spring between the upper and lower jaws for forcing them apart, an adjustable stop for regulating such separation and so controlling the size of the disks or heads produced when the dies are forced together, and means for suitably forcing said dies downward.

In testimony whereof I have hereunto set my hand, in presence of two subscribing witnesses, this 15th day of February, 1902.

ALEX. BALDENWEG. Witnesses:

MAX BALLY, JOSEPH VALLE. 

